| 摘要 |
A three-dimensional position fixing system associated with the keyboard of a digital computer, the keyboard being provided with an array of passive keys which identify the numerals, letters, symbols and other values to be entered in binary code forms into the computer when the keys are touched by a finger of the operator. The system includes a responder mounted on the operator's finger and a transmitter-receiver assembly housed in the computer which cooperates with the responder to yield a signal indicative of the exact position of the finger when touching a particular key. Digitally stored in the data storage of the computer is a table listing the keyboard location of each key and the binary codes of the values identified by the keys. In operation, when an operator touches a particular key with his finger, the resultant signal indicative of the finger position acts to scan the table to select therefrom the key whose location matches the finger position, and then extracts the related binary code which is entered into the computer.
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